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Added a VERSION parameter to the migrate task that allows you to do "…

…rake migrate VERSION=34" to migrate to the 34th version traveling up or down depending on the current version. Added ActiveRecord::Migrator.migrate that can figure out whether to go up or down based on the target version and the current
git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@1780 5ecf4fe2-1ee6-0310-87b1-e25e094e27de